New Generation N62 Engine Chapter 3 P.70
Course Contents/Background Material
© BMW AG, Service Training
- Transmission oil/water heat exchanger (ÖWT)
The transmission oil/water heat exchanger ensures that the
transmission oil is heated up quickly and also that it is safely and
appropriately cooled.
When the engine is cold, the transmission oil/water heat
exchanger (ÖWT) thermostat switches the transmission oil/water
heat exchanger to the engine's shorted circuit. This allows the
transmission oil to heat up as quickly as possible.
From an ÖWT thermostat return flow water temperature of
82 ºC, the ÖWT thermostat switches the transmission oil/water
heat exchanger to the low-temperature coolant radiator circuit.
This cools the transmission oil.
- Electrically-operated fans
The electric fan is integrated in the cooling module and is fitted
flush against the radiator.
The speed is regulated by the DME.
- Viscous coupling fan
The viscous coupling fan is driven by the water pump. The noise
output and the performance of the fan coupling and the fan
wheel have been optimized compared with the E38M62.
The viscous coupling fan is the last cooling level and switches
on at an air temperature of 92 ºC.
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